Muscle Structure and Function Quiz

Sarcomere

Myofibril

Muscle fiber

Fascicle

Cardiac muscle

Smooth muscle

Skeletal muscle

Epithelial muscle

Actin and myosin filaments slide past each other, shortening the sarcomere.

Myosin filaments dissolve, allowing actin to contract.

Actin filaments break down, causing muscle contraction.

Myosin filaments elongate, pushing actin filaments apart.

Tropomyosin

Troponin

Myosin

Actin

ATP provides energy for the detachment of myosin heads from actin.

ATP binds to actin, causing it to contract.

ATP is stored in the sarcoplasmic reticulum for future use.

ATP is converted into ADP, which powers the contraction.

Producing movement

Maintaining posture

Storing calcium

Generating heat

Both have striations, but cardiac muscle cells are branched and connected by intercalated discs.

Cardiac muscle is smooth and lacks striations, unlike skeletal muscle.

Skeletal muscle cells are branched, while cardiac muscle cells are not.

Both types of muscle have no striations and are involuntary.

It stores and releases calcium ions.

It synthesizes proteins for muscle repair.

It generates electrical impulses for contraction.

It provides structural support to the muscle cell.

By releasing hormones into the bloodstream.

Through electrical impulses transmitted via motor neurons.

By increasing blood flow to the muscles.

By altering the pH of the muscle tissue.

It stores oxygen for use during muscle contraction.

It breaks down glucose for energy.

It transports calcium ions within the cell.

It provides structural support to the muscle fiber.